Abrading apparatus



Feb. 13, 1945- w. A. ROSENBERGER ABRADING APPARATUS Filed Feb 1 1938 5 SheetsSheet l M W/zam Afiosemelyer Feb. 13, 1945. OSE BE GER 2,369,408

ABRADI NG APPARATUS Filed Feb 1, 1938 5 Sheets-Sheet 2 J /I ////'am A. [Pose/we er ,5

Feb. 13, 1945. w A, RQSENBERGER 2,369,408

ABRADING APPARATUS Filed Feb. 1. 1938 5 Sheets-Sheet 3 cub-WW Feb. 13, 1945.

W. A. ROSENBERGER ABRADING APPARATUS Filed Feb. 1, 1938 5 Sheets-Sheet 4 3 vu onion 7207/52/27 A. Roseizb eryer 1945' w. A. ROSENBERGER 2,369,403

ABRADING APPARATUS Filed Feb. 1, 1958 5 Sheets-Sheet 5 Fig. 5.2

' 35 ii fl/z'am A. Rwenbmyer ilttomwqq Patented Feb. 13, 1945 r 2,3 9,408" ABRAnING APPARATUS 3,,Willi3l'fi A. Rosenberger; Hagerstown, Md., as-

, signor to Pangborn Corporation, Hager stown, MIL, a corporation of Maryland This invention relates" to abrading apparatus and more particularly toabrading apparatus of the character embodying bladed rotors for propelling abrasives at abrading velocities at any desired form o'f'work, such as castings,steel sheets,

stampings and the like to besurface cleaned of l adhering molding sand,scale, and other extraneous matter,.and also to change the character Although bladed rotors are in commercial use today for blast cleaning purposes they are not wholly satisfactory from the standpoint of maintenance as they embody a stationary central cage through which the abrasive is fed to the blades and the wear on this part is quite severe andfrequent renewal thereof is necessary. Such-machines in the majority of applications must blast downwardly, with the result that a rotatable impeller must be used to propelthe abrasiveput 'of an upwardly facing-discharge port in the cage and it has been found that the life of impellers is even less than th'atof the cages, due to the grinding action set up by theabrasivetrapped between it and the cage. l

Abrasive propelling rotors which do not employ a cage or an impeller have been heretofore proposed, but they have not proved commercially feasible. In one form of machine the blades terminate short of the axis of rotation andithe" abrasive is fed into the central space. However, that machine discharges the abrasive upwardly, and as most applications require that the blast be directed downwardly from the rotor, it found of the surface by roughening, peening or the like.

but extremelylimited application. Another machine of the "prior art which employs neither a feed cage nor impeller embodies a plurality of blades secured'at one side edge to the-rotor, and abrasive is fed through a feed spoutover the side edgesof the blades adjacent the axis of rotation. Although this machinemay be caused to l dischargein any desired direction from the wheel H by adjusting the discharge endo'f the feed pipe angularly about the axis of the rotor, it is open to several serious objections which render it com mercially unfeasible in view of the high volume of work that must be rapidly handled today. For" instance, the side edges of the blades, which must cut the abrasive ribbon issuing from the feed pipe," not only wear rapidly but their side edges also 1 form a barrier to abrasive flow when operating r at highspeed, which in turn causes the machine to choke* if more thanavery low and non-commercial flow of abrasive is fed tothe machine.

By reason of the fact that in such machines the abrasive musthorizontally jump the gap be 1 Application February 1, 1938,'Serial No. 188,163

, 16 Claims. l (01. 5199) tween the stationary feed pipe and the edges of the rotating blades, a considerable quantity of abrasive isnever picked up by the blades andperforms no usefulwork'; a i

It is accordingly the major object of. this in-- vention todevise a centrifugal abrading wheel which does not embody a feed cage and yet propels commercial quantities of abrasive downwardly upon the work, with a minimum of wear upon the parts and operates with a maximum" utilization of abrasive. 1

A further important object Is to provide a centrifugal. bladed abrading wheel 'i'n which the abrasive is fed downwardly to a point'axiallyofiset from the path ofthe blades, and rotating parts of the wheel pick up the abrasive, deflect it axially, Y and then propel it outwardly into a the blades.

Another object is to provide a centrifugal, bladed abrading wheel in which the abrasive is fed downwardly to apointaxially offset from the path of the blades through a feedjpipe that isinclined so as to impart an axial velocity component to the abrasivaand rotating parts of the wheel pick up the abrasive, deflect it axially, and

then propel it onto the blades with an initial outward velocity. I A further object abrading wheel which does not embody a stationary feed cage and yet is operable to propel commercial quantities of abrasive either downwardly or sideways at abrading velocitiesand embodies means for variably adjusting the action-of the wheel upon the abrasive as it is initially.

' blade constructions, reboundguards,renewable and replaceable parts and other more detailed but yet important features thatwill become apparent as the specification proceeds in connection with the annexed drawings, and from the ap-,

pended claims, a l l Afurther' object is to devise a centrifugal abrading wheelwhich does notembody a feedis to provide a centrifugal a minimum of wear upon the parts and operates with a maximum utilization of the abrasive.

In the drawings:

Figure 1 is a longitudinal sectional view Figure 2A is a fragmental sectional view taken on the line 2A-2A of Figure 2 illustrat ing the cooperation between the blades rand blade guides;

Figure 3 is a diagrammatic view-illustrating Figure 21 is an end elevational view of a mod ified form of spout holding assembly; and Figure 22 is a view similar to Figure 1 but shows the wheel equipped with abrasive rebound plates for vpreventing premature discharge of the abrasive from the deflector assembly.

Figure 28 is a longitudinal sectional view of a modified form of apparatus also forming part of=thejinvention.

Figure 24 is a fragmentalsectional view taken on the line 24-24 of Figure 23.

--Figure 25 is a :fragmental view of a modified --form of=deflector forming part of the invention.

Figure 26 is a sectional view taken on the line 1?, 26-2'6 of Figure 25, looking in the direction of the deflector members develope'd'out' in"ahori- ,7 zontal plane and shows them in top plarliliewv with the feed spout in cooperative relationship therewith Figure 4 is a fragmental sectional view'of onef z of the deflector members sand .is :taken on the lined-eiotFigurefg; i 1

:Figure 5 risxa perspective @view ofxthe deflectorassembly of the machine shown in Figure s1.-as. it appears when .removedirom the machine and oneof theabrasivepropellingbladesshas beenrillustrated as associated therewith;

Figurefi .is alsoia perspective ViGW of the deflector assembly but illustrates the rear .iace thereof v Figure 7 is an end elevational view of the machine shown in Figures .-1 and-2 'ancLis somewhat similar :to Figure zxbutrillustratesia stationaryirebound :member :associated 'with .the rotor.

Figure 8 =is a .sectional view :taken a on :the line MBlofFigureTi; v i

:Figure 9'is arview somewhat .similarito Figure 3, but illustrates a'modified form of deflector-assembly; t

Figure 310 a longitudinal sectional .vi ew of the deflector rassembl y diagrammatically represented 1in.Figure;9; I

:Figure l l is aidiagrammatic sectional viewrillustrating :a modified arrangement -nf' the deflector- :and abrasive propelling blades -.of the mechanism :shown in Figures 1 ,to :6, inclusive;

Figure 12 is a view similar to Figure 11 but illustrates a :further arrangement of the 'parts andeaimodifiedwdeflectorassembly; I

Figure .13 is -,a-.di'agrammatic view-illustrating the (various ways .in *which the iced spout ay be adjusted in the machines @of v.i ligures :1 4:0 12, inclusive; l

iFigure 1.14 .is an end elevational aviewcillustrating a wheel having a further modified :form of feedspout;

Figure -15 isaa viewrsimilareto Figure 3:.but illustrates a modified form of feed spout tcooperating awithethe' defiectorsassembly;

:Figure' :16 is .a longitudinal sectional view of the structure: shown in Figure 15 and zillustrates the manner in which the feed spout cooperates with. the deflector; a

Figure :1-7 is ea view :similar to .Figure :15 but illustrates afiurtherzmodified -.orm\ of spout conperating'with thetdefiector;

:Eigure :18 is ea :longitudinal efragmental :sectionalwview of a funtherlformlof rdeflectoraassemblyeoflsectional character;

Figure 19 is a longitudinal sectienal view-of line ill-e20 oirFigure-dil;

the'arrows.

"With "continued'referenceto the drawings,

whereintlikerreference characters have been employed .to designate likeparts throughout the 'severalW'ieWs thereof, I have illustrated a preierredtembodiment of the invention in Figures 1 to is, inclusive, :andwith zparticular reierence to these figures, the machine is preferably equipped. with a housing J10 having inside :re-

placeable zwearhliner plates J7], J2 and l3.

Briefly described, the .machine icornprises a central deflector assembly 3," which is operable to receive abrasive-fromiatfeedspouteD.and conduct it axially over the inner ends rof aplurality=of.blades.C .carried byitherotor.

.The'toptof theihousingl ispreferably closed by a .closur.e plate and liner (not shown) :and the bottom thereof is ventirety open land mnobstructed lfor the freeidischargeeof abrasive lfromathe apparatus. aAeshaft M extends into mousing .Lfl

andlis provided withwa hub portion $1 5, lto which ahead or motor :16 is tremovably secured by means of cap screws orathe like .(not shown).

Rotor, A16 ris provided with a -.cent'ra.l ap ture which fits over ;a piloting portion l l stormed on hub .15. It=is .tom.be understood that :althoughl haves shown a specificrotor, .construction,sany 1 desired .rotor construction may be usedzhavin zoutwardly extending blades and iitmay Joe ."of the doubledisctypegi. e., the blades ,-may. be;int.er

posed between 'two irotatable :discs, without adeparting irom the spiritof .the invention.

\secured to the-front .f ace of rotor i6 by means of a @pluralitymfscrews 'llararea plurality of segmenteshaped-plates-=18, which -form guideways for \thetblades. Each .EPlate li.8,.isit ref.erably provided with .an arcuate .boss as which serves to strengthen the plate ragainst Aflexurein u'esponse to .lforces developed itherein ithrough :operation of the wheel. The rear -.surface-- of .each plate .18 is provided with :an ;arcuate :recess 119.1; which cooperates with arcuate members ,lsb secured in recesses i922 -in head :16. Members 19b, which may if desired take the .formaof .pins, serve to eaccuratelyrlooate ;-p1ates H3 :and-ialsoassist screws -ll'la in holding them in :position againstcentrifugalthrust.

Blates l8 areesecuredlto-headdfiinzspaced apart relationship as shown, andiseeniiniFi-gure .2A

they are ,provided =.with rbeveled ineighboring edges 2! which cooperate zto provide rdovetaile shaped, iou-twardly extending :blade \guideways.

As seem in Figure-.-2 thenguidewayszare apreferably inclinedaat an angle of-zapproximately 10:for-

wardly with erespec't to .:a iradius passing :through their inner ends. .In other words, :the blades rare inclinedcoutwardly andvforwardlywith respect'to the direction ;of .-;rotation of zthe ahead. :Mounted' for sliding movement 'zeach guideway :is :an' abrasive propelling :blade :13 qhaving 1a dovetail'ed;

has an abrasive retaining between the parts to rigidly but removably by a stud 34 which projects through an open- 2,869,408 base 22 which fits between surfaces 2| of plates l8 and the face of therotor. Each blade is provided with an abrasive propelling surface 23 and flange 24 at its free edge. Blades C may be releasably locked against outward movement by any 26 having lug portions 21 which seat in recesses 28 formed in plates l8 as seen in Figure 2. Keys 26 bridge the outer ends of the abut the outer ends of blades 0, so as to prevent their outward movement. 7

As seen in Figure 1, keys 26 are restrained against axial movement to the right whenthey are in locked position by means of a shoulder 29 provided on the blade. by shoving them inwardly slightly beyond their operative position; keys 26 are then inserted with lugs .21 in openings slid outwardly into firm engagement with the keys and with shoulders 29 inlooking relationship therewith. If desired a spring 29 or the like may be .used to establish sufficient friction prevent the bladesfrom sliding inwardly when the wheel is stopped.

The rotor I have disclosed accordingly comprises a disc having a plurality of outwardly exsuitable mechanism, and i I preferably employ a plurality of key members I guideways and 2B, and the blades arethen The blades: are installed tending blades which terminate short of the axis of rotation of the head to define a central space, and although I prefer to employ this construction, as it allows my novel feeding mechanism to be installedin the center of the wheel, it is to be understood that the invention may be practiced with wheels embodying blades which extend entirely to the center. of the rotor.

I will now describe the novel deflecting and feeding mechanism of the invention and which isdesigned to wholly eliminate the central feed cages of the present commercial wheels, therebyobviating the use of a stationary member which is subject to severe wear in use. i

A deflector member, which is generically designated as B, is mounted centrally with respect to the rotor in the central space hereinafter it may assume other shapes and be located other than centrally of the wheel.

. The deflector assembly comprises a generally conicalsection 32 which terminates in a cylindrical flange 33. Flange 33 seats within the central opening of rotor l6 and the assembly is held in place on thee-rotor ing in a web 35 of the deflector assembly, and a nut. 36. Abrasive isfed to the wheel by any suitable means. sembly D, which delivers the abrasive downwardly and preferably axially toward the rotor and having a discharge end closely adjacent the outer surface of the deflecting assembly B, as shown in,

Figure, 1, to define what will be hereinafter termed a delivery or pick-up zone for the abrasive.

The outer surface of the deflector assembly is preferably so formed as to smoothly pick. up the abrasive issuing from the feed spout assembly D and propel or conduct it axially toward rotor l6 and then propel it outwardly over the inner ends of blades 0, preferably in a somewhat upward direction so that the blades will discharge the abrasive downwardly through the open end of the housing upon. the work.

1 The construction of the preferred form of defiector is shown in detail in Figures 5 and 6, and

defined by the inner ends of the blades, although as pointed out For instance, a feed spout as- .tion with Figure 4, are

flector'assembly is preferably provided withan outer conical surface 38 although it may beof cylindrical form if desired. a

surface and which are preferably equal in number to the number of blades employed. As the particular wheel illustrated embodies four blades, the deflector has been illustrated with four deflecting members39. If, the rotor is provided with more Or less than four blades, the number of deflector members is correspondingly increased or decreased. As seen in Figures 5 and 6,.members 39. extend to the very end of the deflector member and as seen in Figure 5 they are provided with comparatively thin leading ends 4i and generally helical impelling surfaces 42, which as seen in Figure 4 are inclined slightly forwardly with respect to the direction of rotationzof the deflector assembly. In other words, they .00-

operate with surface 38 to form an abrasive holding trough. The degree to which the outer edges of members 39 overhang surfaces 42 is more clearly seen inFigure 3,.whereinthe four deflecting members of the deflecting assembly have been la d out in horizontal plan. a

Members 39 are provided with inclined outer surfaces 44, which, as seen in Figure 4, areinclined with respect to the surface of revolution generated by the cutting edges of members .39 and designated as45. The deflecting members 39. are cut away in this mannerto enable surface 42 to cleanly sever portions of the abrasive stream as it issues from feed spout D. Surfaces 42, which as pointed out hereinbefore in connecconcave in section and smoothly merge into substantially radial pro.-

0 pelling surfaces 46,,and the latter merge into conicalsurface 38 of the body of the deflector. Propelling surface 46 are joined by a circular flange 41 which is provided with a-plurality of notches 48 for a purpose pear. As seen in Figure 5, wherein one of the blades C is illustrated in the position it assumes with respect to the deflector assembly, with propelling surfaces 46 preferably substantially aligning with the propelling surface 23 of the blade, so that the abrasive propelled. outwardly by surface 46 may smoothly be delivered to the pro I pelling surfaces of the blades. Also as seen in Figure 6, surface 42 smoothly merges with propelling surface- 46, so that there is a smooth transition from one surface to the other and the abrasive does not undergo any impact whatever as it travels from surfaces 42 to surfaces 46.

Taking the operation whole, with rotor I6 operating at approximately 2450 R. P. M. in, the direction indicated by the arrow in Figure 2, and with abrasive being fed to the apparatus through feed spout D (preferably at a rate from 15,000 to 30,000 pounds per hour), the abrasive freely drops by gravity between the spaces defined by deflecting members 39 and is smoothly picked up on inclined surfaces 42.. In view of the fact that surfaces 42 meet surfaces 44 at an acute angle, the abrasive ribbon issuing from the feed spout is smoothly cut and surfaces 42 are supplied with a substantial quantity of abrasive eachtirne they sweep past the feed spout. The body of abrasive picked up by each surface 42 is not batted or impacted by reason of the fact thatsurfaces 02 are disposed at an angle of preferably less than 45 with particular reference to these figures, the. de-

that will presently apof the machine as a,

I struction provided, it

withmespecttoathe plane ofr the "rotor, thereby rcausing them to exert a -sliding pick-up of i the :avoided :by the'inclination of surfaces 42 with re- 'spect'to surface 38. In other wordsyany im- :pacting action upon the: abrasive due possibly to defects in surface 42 is directed 'down toward surface 38 ratherthan outwardly of the machine.

The bodies of-abrasive picked up by-surfaces '42 are propelledaxially toward the rotor by reason of l the rotation of the parts and upon reaching surfaces 46, the abrasivesmoothlyslides outwardly onto blade C. In view of the fact that by this time the abrasive possesses considerable rotative speed, centrifugal force manifests itself as an outward movement of the abrasive onto the inner end of blades C, where it is smoothly picked up and iscontinuously accelerated until it is discharged from their outer ends 'at an abra'ding velocity. I

It is therefore seenthat byreason ofthe conis 1 possible to gravitationally discharge abrasive downwardly upon the deflector member and cause" it to be'axially directed into the rotor and be accelerated thereon and be'projected downwardly fromthe blade tips at an abrading' velocity without resorting to the use of the impellers and stationary feed cages of the wheels now in commercial use. a

"When the abrasive-attains" the outer-ends of the blades it is discharged therefrom as indicated by the arrows 5!- in Figure 2. The abrasive maybe fed to the deflector mechanism by any suitable means but I prefer to use the'spout assembly shown in Figures 1 and 2, and 'it'will'now bedescribe'd.

I-Iousing H) and liner 13 are provided with openings -52 and 53, respectively, and secured -thereover, as operation, is a spout housing 54. The lower portion of openings 52 and 53 is closed by an approximately circular plate 55 which is releasablywsecured in place on housing H! by means "of a 'plurality of cap screws 56 or the like. Housby means of a welding or'like inginl is provided with a flat upper wall 5'! hav-' 'inga slot '58 of limited length therein. A plate "59 is mounted for sliding movement upon the wall 51. A feed spout 64 is secured to the plate 'SSbyJmeans'of a pair ofbrackets 6|, interposed "rubber gaskets 62, and a plurality of screws 63. The feed spout 64 as seen in Figure 3, is 'ofa rectangular form, although it may be circular or oval in section, if desired,

. The feed spout assembly i accordingly mountedfor sliding movement transversely to the axis of rotation of the wheel by reason of the sliding connection between plate 59 and wall 57. Plate 59 is adapted to be releasably locked in place by means of a pair of set screws 66,-which are threaded into a pair of bosses 67 carried by housing In and which are adapted to bear against the upperpart of plate 59 and clamp it against plate 51. As indicated in Figure 2 the'spout 64' is disposed inits centrally adjusted position.

As seen in 'Figure l, the lower end of spout 64 inclines downwardly andtoward the deflector assembly. Abrasive may be supplied to spout 64 in any suitable manner, preferably through a gravity 'drop of two or more feet 'from a valve or metering mechanism to supply it at a predetermined rate of flow. 'tion of the lower end of spout G l/the abrasive, after'dropping freely through the spout, isgiven an axialmovement. In otherwords, tbs-abrasive By virtue of the'inclina'- aeoearos isfgiven an axial ccomponentpf velocity; withzzth'e itup4they1a1ie a final axial velocity component. Therefore, the axial component 'of' veg locity imparted to the abrasive by reason of;-the inclination of feed spout D prevents impact between deflecting members 39 and the abrasive when it is picked up; thereby further minimizing any tendency forthe abrasive to .be-thrown prematurely from the deflector.

1 As seen in Figure 2, and slightly .forwardly with respect 'to the direction of rotation of head 't-B'and this "is preferably done in order to'reduce the outward component of velocity'o-f the abrasive and preventit 'from discharging prematurely against the sidewalls of the casing. 'In other words, the'radial It is to be understood, however, thatimy invention is not'limited to blades inclining'in any particular direction with respect'to the direction of rotation of the wheel. As a matter of 'fact they may, if desired, be provided with a pocket or-other irregularities at their inner ends'for further delayingorreducing the radial component of velocity, and the appended claims are be provided on the rotor for "cooperation with the notches shown in flange 33.

Although I have shown a wheel operating about a horizontal axis it is to be understood, that if desired, the axis may be inclined'at an oblique angle or be disposed*verticallywithout departing from the spirit of the invention.

In Figures 7 and 8 of any" abrasive that may ran to'be properly picked up by deflector members 39. 'The reboundguard is provided with a web issecured to housing l0 by means of a pair "of cap screws 12. The guard is provided with a short rebound surface 73 and a long curved rebound surface 74 which is con-cave in section as seen in Figure 8. I

In this form of the invention, with the machine operating and abrasive being supplied through spout 64, it is picked-up in the manner previously described by the deflecting members 39. Any abrasive that is struck by the :corners defined bythe merger of'surfaces 42 and 44 assume Various forms depending upon the conditions encountered in the operation ofthe 'wheel and, therefore, the invention is notlimited'to the particularform'illustrated.

blades C incline outwardly portion "H which I In Figures .9 and. I have'shown a slightly modifled form of. deflector assembly and it differs in two respects from that shown in Figures 1 to 6, inclusive. First, it is provided with deflecting members 390. which are inclined at a smaller angle with respect to the plane of the rotor than those of Figures 1 to 6, inclusive, so as to exert a less severe propellingaction upon the abrasive when it is first picked up. Secondly, a plurality of baflle or rebound members'l5 areprovided forwardly of each deflecting member 390.. and which are designed to confine the abrasive to a definite path on its way to theinner ends of the blades, which is particularly important when an excessive quantity of abrasive-is fed to the wheel. The deflecting members 39aeach terminate ina comparatively'thin leading edge Ma. The outer or peripheral edges 44a of the deflector members also overhang the impellingsurfaces 42a as shown in Figure 9. The impelling surfaces 42a. in this modification also smoothly merge into substantially radial propelling surfaces 46. The flange 41a in this form of thedeflector is quite similar to the flange 41 in the arrangement shown in Figures 3 and 5, except that one end of each of the ballle members is formed integral with the flange 41a. w I g In Figure 11- I have somewhat diagrammatically illustrated the parts of the machine shown in Figures lto 6, inclusive in a somewhat different relationship. With reference to Figure 11,

setting of the spout designated 83, so as to discharge at the three or four o'clock position.

It is of course understoodin connection with all of the forms of the invention, that if it is desired to operate the wheels in the opposite direction from the. counter clockwise direction shown, a deflector assembly having oppositeh-anded deflector members and a rotor .having opposite-handed blades will be used, and the discharge from such wheel will occur symmetrically opposite to that shown in the left-handed wheels.

. Another form of feed spout that may be emblade C terminates short of flange 41 so as to be spaced therefrom, and it is also disposed rearwardly of propelling surface 46 with the result that there is a lag between the delivery of the abrasive over the outer end of surface 46 and the pick-up of the abrasive by propelling surface 23 of blades C.

The path of a particle discharged from surface 46 is plotted at 11 in Figure 11 and it is seen that the particle attains substantially the position 18 before the blade illustrated in dotted lines, picks it up. 1 N If desired, propelling surface 46 of the deflector assembly maybe rearwardly inclined with respect to the direction of rotation or it may be forwardly inclined.

In Figure 12 I have illustrated a deflector assembly wherein propelling surface 46a is inclined forwardly with respect to the direction of rotation of the wheel so as to exert some degree 1 of retarding influence upon the abrasive as it passes outwardly for delivery onto blades. C.

It is to be understood that the invention is not limited for use in housings havinganopen bottom but may be mounted to discharge horizontally either side of the wheel or upwardly depending upon at which angular point the I abrasive is admittedto the deflector assembly.

In Figure 2 the adjustment may be varied by loosening screws 66 and moving plate 59 so as.

to dispose the feed spout in different positions.

In Figural? I have diagrammatically illustrated the manner in which discharge is effected by moving feed spout D. With reference to this figure it is seen that when the feed spout D is in the position illustrated at 82, the abrasive is admitted to deflector B at approximately the three oclock position with the result that the abrasive discharge occurs to the side of the wheel approximately as indicatedby the arrows 8|. If desired. the feed spout may be moved into the positiondesignated 84 ior causing the discharge to beflate as regards the central .ployed to feed abrasive to the deflector assembly in offset relationship is illustrated in Figure l4 wherein feed spout 64b is provided with an inclined portion 88 terminating closely adjae cent the deflector assembly in approximately the3 oclock position so as to cause the discharge to take place to one side of the wheel as indicated by the arrows 89.

In Figures 15 and: 16 I have shown the impeller of Figures 1 to 6 inclusive as being fed with a modified feed spout 640. In Fig'urel5 the deheater is illustrated in developed form and feed spout 640 is observed to be of elongated trapezoidalcross-section and is disposed at an angle with res ct to the axis of rotation of the wheel. This wheel operates much in the same manner as those previously described except for the cut is of a slowly progressing character, but in 1 view of the fact that by the time the deflector has cut partially through the abrasive ribbon the last portion of the ribbon is cut by a part of the deflector close to blades, the entire mass of severed abrasive is in effect collected and is delivered to the blades at approximately the same instant. This results in the wheel discharging through a more limited arc.

Under some conditions, itmay be to use a feed spout of the character shown in Figure 17, wherein a feed spout 64d is inclined in the opposite direction, namely, so as to cause the abrasive to be more rapidly cut from the abrasive stream. However, as the entire mass of abrasive is cut by the same portion of the deflector, the discharge will occur over a wider arc thanwith the feed spout of Figures lfu and 16. In Figure 18, I have shown a modified formof deflector assembly D wherein a primary or sup porting. member llll .is provided and which is secured to the rotor and it in turn carries the deflector member proper I02 and which is provided with the deflecting members 3911 and flange 41b and the other parts previously de- I ing guidewa-ys as previously described and blades;

l in this, instance the central deflector assembly is dis- C are slidably disposed therein. However,

pensed with and a separate individual deflector I04 is provided for eachblade and it is provided with a dovetailed base. I05 so that it may be slidably mounted in the same guideways as the blades.

Each deflector member, as seen in Figure 20,

It is observed that as. members 39 pass desirable is" provided-with a-ge'nerally helical 'pick up -sufl abrasive fromstrikingtheuper sideof plate l8 1 thereby minimizing wear'thereofz Inorder to prevent-the deflector members from moving inwardly outof='their='guideways, I provideacentral plate ll2 'whicl'i isrem'ov-ablyseo'ured to the rotor by a set 'screw H3; a n'd wh ijch abuts the inner ends of'the' deflectors; As seen inzFigure 19, rotor lta is prov-ided with anannular boss ll5 which prevents outward'movement of the-blades and deflector members.-- The blades and deflector members-are removed 'by removing plate" I l2' and moving the-- parts lntothe centerof'the wheel and re'movihg' them"axially. -If-' desired, however, the r-otor 'a'nd the keysztof Figures 1- and 2 may -be= employed to hold the blades anddeflector .membersin position on'the rotor.

Thisform of the-invention functions in substantiallythesamemanner as the form shown in Figures lto 6', inclusive, asthe abrasiveissuing 'frorn feed-spout D is picked up by deflector members- 1'04} and is thrown" into" the blades and discharged therefrom at" an abradingvelocity. By reason of the construetion-of this form ofthe invention; the-blades and defiector'members are readily removed-and replac'ed when' they become so 'WOIII as 'to' beunfit for "fur-therservice.

In Figure 21 I" have shown'a modified form of spout hol'ding assembly, and as it difiers from that shown in Figures" land '2 only inthefact that the spout is angularly adjustable rather than transversely.

In this form of thein'vention; plates Slira-nd so: are curved so= that uponreleaseof-' screws 66d; the spout may be adjustable-angularly about the axis of the 'ma'chine' through the angle I H 8, to'vary-the point of admission of abrasive to the deflector. Housing- 54a'-isprovided with a-ourved lower wall'anda=modifled-form of closureplate H9 cooperates therewith and is held in place on the casing I'll by means or capscrews (not shown). In this-'modification th'e feed spout 64 is also mounted on the plate 59a by means of a pluralityof bracket-sold so-that' theabrasive supply pi'pe may be moved circumferentially through the-slot 58a which is providedin'the plate 5121.

In Figure 2 2 I have shown the machine of Figures 1 to 6; inclusive; equipped with guard plateswhich are usefulin certain installations. Secured to the end of deflector B by means'of 'nut 363s adisc I21 which preferably is of adiameterequal to' the' overall diameter'oi deflector members 39', for" preventing abrasive from-rebounding to the right in this figure andescaping from the defle'ctor assembly."

Disc I21; accordingly, cooperates with mem bers 3-9 todefine closed-pockets and therefore if desired the-deflector'membermay be" formed or cast with'webs joining; their'leading edges 4 I; so as to thereby obviatethe need'for disc= IZI.

The machine may also embody" an annular plate l2 2 which is secured to the side edgesof the-blades or any'other suitable rotatin'g'orstavelocity; when. it; is thrown in: this; manner, it

produces. no appreciable wear; of; the housing. If this rebounding;abrasive were allowed. to. enter andzbe. picked upzby, the blades it would-be .propolled, at anzabrading velocity/against. the inner.

wall-of; the-housing,- producing. considerable ,Wear

thereof It. should; be: particularly observed in. connecz-v l tion witlrall .of the formssof invention disclosed;

that; as: the inner: ends of the; blades are; not. callediupomtogcut the; abrasive stream, they need embodying what: may be, termed arr-,internali deflector,. as the. deflector members are disposed inside auc ylindrical shell.

The rotor construction is; thesame as.- that shown inrFigures: 1 to 6,..inclusive, and: embodies rotor l6 and blades C. Secured to. rotor 16 in therspacedefined: by. the inner ends of, plates I8,

. in Figurez24.

by 'means of azbdlt I25; isra deflector assembly I26, comprising:aicylindrical;shell; I2?! having a plurality) of. discharge ports [2 8 registering with the four blades of the rotor.

Provided on thainn'er wall-.ofmember; I21 are four deflector: members I29: which correspond generally. in: structure. and function to deflector members 39 of the previously described forms of the: invention; Each: deflector member is provided with a. helicalabrasive pickrup portion I3 I. andzai substantially radial ,propellingyportion l32. which; aligns:- with. onezwall. of? opening I28 and: which. in turn, substantially registers. with the propelling: surface 23. of. the. blade; seen Feed. spout: D projects. into; member I21 and feeds the. abrasive onto; helical portions I:3lof thedeflectors andiit ispropelledwaxially onto surfaces l32; Surfaces I3Zin'turn propeltheabrasive-th'rough. openings 1 I28 onto the inner endseof the blades.

Asittalgesapproximately one-half of arevolue tionto dischargej-theabrasive after it has-been admitteditotheinner ends oiithe blades, and asthe abrasive is fed. onto the blades inapproximate.-

5 ly-the. 5 oclocklposition-in thewheol ofv Figures 23 and 24,11; will discharge upwardly and itis ac.- cordingly primarily intended: for installation where theabrasive mustbe thrown upwardly, although the point of'discharge may be varied to some. degree by. angularly adjusting the position of the discharge end. of thefeed spout, as previously set forth:

Although I have'shown-m'ember I27 as'being of enerally cylindrical 'form it is to be understood that" it may be of cQneSl-iape'd configuratiom if essential characteristics thereof.

embodiments are therefore to be considered in all desired, with thediameter' of the cone increasing toward the rotor, so as to allow centrifugalforce to manifest itselfand assist in feeding the abrasiveover helical surfaces it], without departing from the spirit of the appended claims.

-In Figures 25 and 26 I have illustrated a non.

fledform of deflector assembly somewhat similar tothat of Figures 1 to 6, inclusive. In this form, however,there is provided a preferably concave surface [4| smoothly meeting surface 46 along a curved line I42 and smoothly meeting surface 38 along curved line I43. In this form of the invention, the abrasive isaxially propelled by surfaces 42 asbefore, but when it reaches surface Ml it is smoothly deflected outwardly onto the vanes.

Thiseffects a more uniform distribution of the abrasive throughoutthe width of the blade. -If

desired, surfaces Ml may be convex or be provided with bumps or other formations, depending upon the conditions under which themachine is opera ating, in order to get the tion of the abrasive. I

The invention may be embodied in other specific forms without departingfrcm the spirit or The present best possible distriburespects as illustrative and not restrictive, the

surfaces disposed in said pick-up zonejandextendingto a region adjacent the inner ends of saidblades for axially deflecting the delivered abrasive onto said blades adjacent the inner ends thereof at a predetermined point in the rotation I ofsaidhead structure for causing said abrasive scope of the invention being indicated by the ap- I pended claims rather than by .the foregoing description, and all changes which come withinthe meaning and range of equivalency of the'claims are therefore intended tobe embraced therein. a What is claimed and desired to be secured by 7 United States Letters Patent is:

1. In an abrading apparatus, a rotor havinga plurality 'of outwardly extending blades, means for feeding abrasive to a pick-up zone in proximity to the axis of rotation of said rotor, and a pluralityof members for deflecting abrasive ,ax ially from said pick-up zone onto saidblades, said members having generally helicaldeflecting surfaces and a baffle member spaced forwardly of each deflecting surface, for controlling the degreeof rebound from said helical surfaces.

'2. In an abrading apparatus, a rotorhaving a plurality of outwardly extending guideways proabrasive is rapidly deflected axially andrintro vided thereon, a plurality of abrasive propelling blades mountedin said guideways, means located at the outer end of said guidewaysfor releasably locking said blades against outward movement, a deflector assembly for feeding abrasive onto the inner ends of said blades, said deflector-assembly having a flange located inwardly of said blades, means for releasably securing said deflector assembly to said rotor, said flange having a plurality of notches therein, to allow said blades to be movedinwardly beyond their locked positions for permitting release of said locking means. 3. A deflector assemblyfor use in an abrading apparatus, comprising a plurality of axiallyextending helical abrasive propelling members terminating in substantially spoon-shaped pockets, said pockets leadingonto substantially radial dischargesurfaces located on said members.

4. map abrading apparatus, a head structure mounted for rotation and having a plurality of outwardly extending abrasive propelling blades provided thereon; means for feeding abrasive downwardly adjacent said blades and delivering :it to a pick-up zone in proximity to the axisof rotation of said head structurebut offset axially 1 blades and bedischarged from the outer ends thereof at an abrading velocity, said abrasive beto be smoothly picked up by said blades and be discharged from the outer ends thereof at an abrading velocity, said abrasive being acted upon solely by said deflector means from the time it leaves said feeding means until it ispicked up bysaid blades. M l I I 1 I j l 5. In an abrading apparatus, a rotor mounted for rotation at high'speed and having at least one abrasive deflecting-blade unitprovicled thereon; said unit having a comparatively 'long abrasive accelerating and propelling surface beginning near the inner end and extending to the outer I end of said blade unit, theinner end of said blade unit having an axially directed deflector portion projecting laterally beyond the side edges of the abrasive accelerating and propelling surface,

thereof intoan abrasiVepick-up zone, said deflectorportion'having a generally helical deflecting surface, andmeans for feeding abrasive onto said helical surface of said deflector portion only while said helical surface is passing through a predetermined arc of rotation, whereby said duced onto the inner end of said accelerating and propelling surface while the latter is passing through a predetermined arc of rotation and is discharged from the outer end thereof at an abrading velocity in a predetermined direction.

I ,6. In an abradingapparatus, a head structure mountedfor rotation and having a plurality of outwardly extending abrasive propelling blades provided thereon; means for feeding abrasive downwardly to a predeterminedpoint in the ro-,

tation ofsaid headstructureand adjacent said blades and delivering it to a pick-up zone in proximityto the axis of rotation of said head struc-,

ture but offset axially from said blades; deflector means mountedyfor synchronous rotation with said head structure and comprising a plurality of substantially helical surfaces disposed in said pick-up zone and extending to a region adjacent the inner ends of said blades for axially deflecting the delivered abrasive onto said blades adjacent the inner ends thereof at a predetermined point in the rotation of said head structure for causing said abrasive to be smoothly picked up byrsaid ing acted upon solely by said deflector meanslfrom the time it.leaves said feeding means until it is picked up by said blades; and a stationarily sup? ported rebound member located adjacent the periphery of said deflector means andimmediately in advance of the feed means with respect to the direction of rotation of the deflector means for rebounding back into the latter any abrasive which fails to be properly picked up thereby. l

from said blades; said feeding means delivering abrasive at only a limited are about the axis of rotation, and deflectormeans mounted for synrchronousrotation with said head structure and '7. In anabradihg apparatus, a head structure mounted for rotation and having a plurality of outwardly extending abrasive propelling blades provided thereon; feeding mean-s for conducting abrasive from an abrasive supply downwardly to a delivery zone located adjacent the axis of rotation of said headstructure, said feeding means and said delivery zonebeing located wholly outside the space defined bythe planes of rotation of the side edges of said blades; and rotatable deflector means, mounted for synchronous rotation comprising a pluralityof substantially, helical said blades;adjacentnthe inner 'end's thereofia a structure, .said feeding nieansidelivering brasivez tOaSfiid'idEfiBCtOl'; means .at: aipredeterminedzpointz in.zthe:ro.tation thereof ,said abrasive ;be"mg;.acted upomsolelyiby:saidmdtatable defle'etorxmea-ns iromi thectimezittleaves saidieed-iirarmeans: until titty 1S" picked; up by said; blades, said: deflecton: meanss comprising a plurality of blade elementsxmounted-f on: said headistructurecandc havin g generally: helical abrasiveidefiecting:surfaces:.

8:.In anabrading: apparatus', aheadxstruoture: mountedifor'" rotatiom and having, a.- plurality of" outwardly. extending; abrasive-- ropelling; blades.

provided F. thereon: feedingameans forz'condnctingg' abrasive. from: an: ahrasive lsupplyi downwardly;-

tozaadeliveryvzone looatedadjacerrt theraxiszoi tationiotsaid head:structure, saidtfeedingxmeansw' andlsaid delivery'zonez-boingzlocatedowhollyrout side the. space: defined-1 by the: planes oiv: rotation: of? the'side edges-pf? said sblad-er; andirotatable; doe fiector. means; mountedyfor; synchronouserotation; with said 'headsstruc-ture 'and rextendingofrom; saidi delivery v zone :to'la1regionsadj acentzthe. inner ends:

of i said blades; for conducting said abrasive from; said deliveryv zone: axially: onto: the surfaces; of;

predetermined ipointain theirotati'on :of saidiheadri structure said feeding.:means delivering: abrasive t0.:said deflector means at predeterminedi poiritx in the -rotation thereo-f said abrasive-beingra'cted; upon solely by said rotatable-1 deflector means from the 7 time it leavesexsai'd' feeding means -until iti is' picked 1 up by "said" blades;- saidlast namedi means: comprising a plurality ofblade elements: corresponding in numb'er torsaid blades anol l i'av'- ing' surfaces terminatingin close proximity 'to the=innerends of said blades,.: said'bladecelements having generally-helical abrasive surfaces extend illzg into said' delivery; zone; and operating: in timed relationship-tosaidblades.. I

' 9.. In an abrading apparatus; .a headstructure; mounted for" rotatiow andzhaving a pluralityrof; outwardly: extending abrasive propelling blades? provided thereon; means= for: feeding" abrasive downwardly: adjacent said blades-end delivering: it to' a pick1-u-p "20118-5111 proximity to-ithe axis :of rotation of saidlhead structure: bnt'zoiiset axially: from said blades; said feeding means 1 delivering; abrasive at only a= limited arcabout thezaxi'ssofr; rotation; and deflector: means: mounted lforrsynchronous rotation i with said head structure: and i comprising a:pluralityaof substarrti'ally helicall'sursfaces disposed in said picls-rupl zone and extending;v

to a region adj acenti'theinner 'endsiofisaid blades;

for axiallyvz'deflecting-theJdeliVeredialbrasivetzontog said' 'blades adjaeent tha-inner endsathereot at as. predeterminewpoint in: thesrotation ofz'said ihead' structure forrcausingrsaid abrasive tozbe'smoothlyi abrasive:iromzamab-rasivesunnly:downwardlyytm picked :up by said'ib'lades and be discharged zfrom' the*0uter ends thereof attantabradingr. velocity; saidiabrasive' sbeing: acted iuponmsolelyiby saidzidea fieotor means'irom the time itrleavessaidieeding:

means until itiisepicked"upzby;saidib'ladesgnand a:

closure at the-ends.-.oi '-said*helical. rsurfacesz in said; p

pick-up: zone; for preve'nting abrasive: from; flow?- ing--' over theend of i said: deflector: means;

10. In an abradingz apparatusg.aahead:structure mounted for rotation: and havingi i mrality. of:outwardlyzextendingsabrasivezpropellingzbladesr provided thereon; feedingzmeans.iforreonductingo a; predetermined point the. rotation 01'. saich headistructure vand-to.zalde-live-ry zone loo-atedia-delament the axiszofirotation:of saidihead structure said feeding" means; andrsaidldelivermzone being;

located. wholly; outside:- th'ez space. defined 1 by the planes oilzrotation. of; the side "edges; of said -.b1ades and: rotatable deflector; means. extendingstromr saidzdelivery'zone. to .=a .region. adiacentxthe: inn-er:

ends; of said;blades, ,ior; conducting; said abrasive;

fromssaidtdelivery zoneraxially onto theisurfacesi ofr aid blades adjacent" the inner ends thereofrati a; 'predeterminedspoint in: the rotation of; said; head structure, .saiddeflector:mean lineluding rm blade :member associated'with reach: of said; pro pollingblades; Leach blade .membersbeingssubstan tially'iflatiat its: portion adj acentr theeinner; ends:

at: said: propel'lingrbladesr and havingaconcava forward face. at itszIJortiOn registering: with .thedelivery zone rto'iretainfabrasive;upon isaidrblader member: and conducts-it tozsaizi blades, .said abra-u sive being acted upon solely by-saidxrotatable de:-: 7

fiector meansfrom the: time it leavesgsaid'iieeding meansruntill itistpickedup by; said propelling;

blades; v

11; In an: abrading apparatus; ahead struo-- tme mounted for: rotation and. havinga plurality; ofroutwardlyextendingyiabrasive .propelling;blades; provided: thereon; f ceding: means for: conducting abrasiveirom anrabrasivesupply downwardlwto.

a; predetermined point: in' the. rotation of. said.

head-:structurezand to; a:delivery -zone-located ad-- jaoentitheaxis .of rotation of-said head structure,- said feeding means. and: said:delivermzoneebeing located:- wholly; outsidecthesspaces defined by the planesof rotation .-of.:the -side edges aof saidbladsz.

and i rotatable deflector: means extending. from said delivery zone to erosion adjacentithe. inner:

ends of said=b1ades-,-.for conducting-said abrasive: from saidideli'verys zonevaxiallm ont'o. itheesurfaces of said-blades. adjacent l thezinner: ends; thereof :at a-predetermined. point in. the rotationv of said head structure-,-.said deflector" meansincludinasai blade member: associated with each. of. said blades,

' each blade :member. extending. forwardly in' the direction. of I rotation away from; said. propelling, blades at .an angle less th'an 45 with respect :to the plane. of. the-.rotor forsubstantially; a distances equal to the-circumferential. spacing; betweenthe blade memberssat' the inner. ends .ofmhepropellingg blades,-,saidrabrasivesxbeing acted upon solely; by; said rotatable; deflector means :from the: time-it lavessaid feeding means until .it-is pickedunby said blades, l

. 1 2.. .Aidefiectonassembly. for. centrifugal iblasting apparatus comprising-, having a, generallysfrust iconical outer. peripheral surface, apluralityoi? blade.members-carried by said support projectingtoutwardly fromrthe periphery-of said frustoconical surfacerand .extend-.

ing. 1 obliquely over'the periphery, of vsaid support;

means. for. supplying abrasive totthe blade. :mema bers while moving, through a-- limited. circumfera ential arclatlth-e smaller diameteriportion of said deflector, I ially byrsaid blade.- members to the largerdiam1-- eter portion. ofr the.- support wheres. greaterciro.

cumferential velocity is. imparted to the deflected abrasive sol thatcentrifugallrforce is developed-to move-:theraxiallyideflected; abrasive radiallm from the deflector.

13; Aldeflector: assemblyz-for centrifugahblasti ing; apparatus comprisingya rotatable support.

having: a generally; frusto conical. outer periphe eral. surface; a plurality-1oisbladermemberstcarriew a rota-table '-'support whereby, the. abrasive is-= deflected axby said support projecting outwardly from the periphery of said frusto conical surface and extending obliquely over the periphery of said support, a lip on each blade member projecting forwardly therefrom with respect to the direction of rotation and spaced radially outward from said support and extending lengthwise of the blade members substantially parallel to said frusto conical surface, means for guiding abrasive onto the blade members while moving through a limited arc in the rotation thereof and at the smaller diameter portion of said deflector whereby the abrasive is deflected axially by portions of the blade members radially inwardly of said lips to the larger diameter portion of the support and beyond the ends of said lips so that the abrasive may move radially from the deflector.

14. In abrading, apparatus, a rotor having a plurality of outwardly extending abrasive propelling blades, means for feeding abrasive downwardly to a region closely adjacent the axis of rotation of said rotor to an abrasive pick-up zone of limited circumferential extent located outside the planes of rotation defined by the side edges of said blades, each of said blades terminating short of the axis of rotation of said rotor and 1 having a deflector member associated with the inner end thereof, each deflector member having an outwardly extending portion substantially registering with the inner ends of said blades and a generally helical portion projecting axially into said pick-up zone and operable to propel abrasive from said pick-up zone onto said blades adjacent the inner endsthereof at a predetermined point in the rotation of said rotor, and the helical portion of each of said deflector members terminating in a flange for preventing abrasive from being centrifugally thrown therefrom.

15. In abrading apparatus, a rotor having a plurality of outwardly extending abrasive propel ling blades, means for feeding abrasive downwardly to a region closely adjacent the axis of rotatiqn of said rotor to an abrasive pickup zone from said pick-up zone onto said blades adja-' cent the inner ends thereof at a predetermined point in the rotation of said rotor, and said eans for feeding abrasive comprising a feed spout having means for adjusting the discharge end thereof substantially tangentially with respect to the surface of revolution defined by the outer edges 7 of said deflector members, for varying the manner in which the abrasive is acted upon by said deflector members in said pick-up zone.

16. In abrading apparatus, a rotor having a plurality of outwardly extending abrasive propelling blades, means "for feeding abrasive downwardly to a region closely adjacent the axis of rotation of said rotor to an abrasive pick-up zone of limited circumferential extent located outside the planes of rotation defined by the side edges of said blades, each of said blades terminating short, of the axis of rotation of said rotor and having a ,deflector member associated with the inner end thereof, each deflector member having an outwardly extending portion substantially registering with the inner ends of said blades and a generally helical portion projecting axially into said pick-up zone and operable to propel abrasive from said pick-up zone onto said blades adjacent the inner ends thereof at a predetermined point in the rotation of said rotor, and said means for feeding abrasive comprising a feed spout having means for adjusting'the discharge end thereof substantially circumferentially with respect to the axis of said rotor.

WM. A. ROSENBERGER. 

